In: Statistics and Probability
The chlorine residual in a swimming pool at various times after being cleaned is given by
| Time (hours) | Chlorine Residual pt/Million | 
| 2 | 1.8 | 
| 4 | 1.5 | 
| 6 | 1.45 | 
| 8 | 1.42 | 
| 10 | 1.38 | 
| 12 | 1.36 | 
Fit a curve of the form
y = a * exp( -b x)
a. What is your 95% prediction for the chlorine resid. after 15 hours?
b. Test the hypothesis that time has no effect on chlorine levels.